Portable excavator



May 20, 1947. F, wHlTE 2,420,990

PORTABLE EXCAVATOR Filed June 11, 1945 mvsmom FRED L.WHITE BY W ATTORNEYPatented May 20, 1947 PORTABLE EXCAVATOR Fred 'L. White, Marion, Ohio,assignor to The Osgood Company, Marion, Ohio, a corporation of OhioApplication June 11, 1945, Serial No. 598,804

6 Claims.

This invention relates to portable excavators and in its more specificaspects is directed to an improved dipper operating mechanism.

One of the objects of the invention is to provide a dipper manipulatingmechanism that is entirely cable controlled or operated which has thedipper under complete control regardless of where the working facehappens to be.

Another object of the invention is to provide a cable manipulated dipperthat is as completely subject to control when the excavator is close byor is removed some distance fromthe working face.

Another object of the invention is to provide a cable operated dippermanipulator that will allow the dipper handle to be extended to itsmaximum extent whether the boom is in its lowest or most elevatedposition.

A still further object of the invention is to provide a means wherebytwo forces may be applied to substantially opposite ends of the handlewithout balancing the forces therein for manipulating the dipper and itshandle.

Other and further objects of the invention will occur to those skilledin the arts to which this invention pertains as the description proceedswhich taken in connection with the accompanying drawings sets forth apreferred embodiment of the invention but such disclosure is not to beconstrued as a limitation of the invention which is limited only by theappended claims and any and all modifications, alterations andvariations of structure coming within the spirit and scope thereof aredeemed to be included herein.

In the drawings:

Fig. 1 shows a perspective view of a portion of an excavatorincorporating the invention.

Fig. 2 shows a view of a double winding drumand controls therefor.

The reduction of weight on the boom and dipper construction for portableexcavators without a reduction in the mechanical strength is anessential in the art. Prior art constructions have employed heavy,cumbersome shipper shaft drives- With complicated mechanism to reverselycontrol its operation. This invention is directed to a mechanism forreducing the number of parts in the shipper drive without decreasing themaneuverability of the dipper and its handle and with an increase in therapidity of control.

The objects and advantages set forth above are obtained in a structureset forth in the accompanying drawings in which I is a portion of thetraction and chassis elements of a portableexcavator. An upper body 2 isshown rotatabl 2 mounted thereon in the usual manner common to the art.

A boom 3 is pivotally mounted on the upper body 2 by means of a pin andbracket mechanism (not shown). The vertical position or the angle of theboom with the horizontal iscontrolled by cables 4, l operativelyassociated with the upper end of the boom 3 and are wound and unwound onan appropriate winch (not shown) mounted on the upper body 2.

The boom 3 has a fixture thereon functioning as a dipper handlereceiving element or saddle block 5 mounted on a pivot 6 secured to theboom" 3. A dipper 7 is fixed to the end of a handle 8, with said handle8 slidably received in the saddle block 5. The handle 8 extends throughanappropriate slot 9 in the boom 3 to thereby enable the dipper assemblyto move relatively to the boom 3.

Rotatably mounted in suitable journals arranged on the upper body 2 is adouble winch or winding drum mechanism Ill set forth in more particulardetail in Fig. 2. This mechanism has two drums H and i2 supported on ashaft l3. Power is supplied to the shaft by means of a gear M which isdriven from a suitable power source mounted on the upper body 2. WheelI5 is likewise mounted on the shaft l3 with the drums H and IZ'betweenit and gear l4. Associated with gear H3 is a clutch is and associatedwith the wheel i5 is a clutch ll. Brake mechanisms l8 and [9 areassociated with the drums H and I2 respectively. The foregoing doubledrum construction is well known to the art and both drums are jointly orseverally operable by means of suitable controls manually actuated.

The dip-per I is retracted and hoisted by means of a cable 26 secured toand windable on the drum I l It is then led over a sheave 2| rotatablymounted on the end of boom 3 and is then led throughpadlock pulley orsheave 22,.thence over sheave 23' also rotat'ably mounted on the end of'boom 3 and is then led around sheave 24 rotatably mounted on the bearingor saddle block 5 for the dipper handle 8. The end of cable 2B isanchored to the dipper handle 8 near the dipper l. When cable 2E) isbeing wound on the drum l I it will hoist and retract the dipper l.Gravitational action will lower the dipper 1 whenever the clutch l6 andbrake l9 are both disengaged. Brake I9 is used to hold and regulate thedownward movement of the dipper 1.

A cable 26 is secured to and windable on the drum l2 which drum acts asa crowd control for the dipper l. The cable is then led around sheave 21rotatably mounted on the lower part of the slide hearing or saddle.block and is then Each of the cables and 26 and their respectivewinding drums H and I2 may be independently or jointly operated bycontrol clutches I6, I! and brakes l8, I9. Retracting ofthe dipper,especially when it has been raised to a high position is largely agravity action but when it is in a lowered position it is retracted bythe cable 20 and also when the boom 3 is in a lowered position. The fulloutput of the engine or prime mover delivered to the gear [4 is appliedto the dipper 7 and its handle 8. The independent crowd enables theoperator to shake the dipper to release adhering materials. When theclutch and brake controls I6, I! and l8, IQ for the drums H and [2respectively are properly jointly and severally actuated a rapid andaccurate control of the dipper is achieved Whatever the elevation of theboom 3 or the degree of extension of the handle 8 through the boom 3 inthe saddle block 5.

That which is regarded new, novel and useful and which is sought to beprotected by Letters Patent of the United States is as follows:

1. An excavator comprising an upper body; a boom on said upper body; apivoted saddle block on said boom; 'a dipper; a handle for said dipperreceived in said saddle block; a pair of winding drums on said upperbody; a cable anchored near one end of said handle connected to one ofsaid winding drums and operatively associated with said dipper to hoistand retract said dipper; a cable connected to the other winding drum andto the other end of the handle to crowd said dipper; and clutch andbrake means associated with said drum to selectively control theoperation of each Winding drum.

2. An excavator comprising an upper body; a

boom on said upper body; a dipper; a handle on said dipper; means onsaid boom receiving said handle to pivot said handle relative to saidboom; a pair of winding drums on said upper body; a cable connectedbetween one end of said handle and one of said drums operativelyassociated with said dipper to hoist and retract said dipper, said cableapplying axial movement to said handlethrough saidhandle receivingmeans; a cable operatively connected to the other end of said handle andto the other winding drum to crowd said dipper, said cable axiallymoving said handle in said handle receiving means; and a clutch and abrake associated with each drum to selectively control the retractingand hoisting and the crowding of said dipper.

3. An excavator comprising an upper body; a boom on said upper body; adipper; a handle on said dipper; a saddle block on said boom in which,said handle is slidable; a double drum winch on secured to the otherdrum passed around said second sheave and anchored such that uponactuation of said drum said dipper will be crowded.

4. An excavator comprising an upper body; a boom ,on said upper body; asaddle block pivotally mounted on said boom; a handle in said saddleblock; a dipper secured to said handle; a double drum winch on saidupper body; two sheaves rotatably mounted on said saddle block, one oneach side thereof; a cable secured to one of drums passing around one ofsaid sheaves and anchored such that the operation of said drum will movesaid handle in said saddle block to crowd said dipper; sheavesassociated with said boom and with said dipper; a cable anchored on saidhandle near said dipper passing around said other of said sheaves onsaid saddle block, and thence about said sheaves on said boom and saiddipper secured to and windable on the other of said drums which uponrotation will hoist and retract said dipper; and mean to selectivelycontrol said drums such that said dipper will be selectively hoistedretracted or crowded.

5. In a portable excavator; an upper body; a boom on said upper body;sheaves rotatably mounted on said boom; a dipper having a sheavethereon; a handle for said dipper; a saddle block pivotally mounted onsaid boom in which said handle is slidably mounted; a pair of windingdrums on said upper body; sheaves rotatably mounted on said saddleblcck,one on each of two sides thereof; a cable anchored on said handle,passing around one of said saddle block sheaves, then about said boomand dipper sheaves and secured to one of said winding drums to hoist andretract said dipper; a cable secured to the other winding drum, thenceabout the other saddle block sheave and anchored with respect to saidhandle to enable it to axially move said handle in said saddle block tocrowd said dipper; and

means to control said drums to thereby hoist, retract or crowd saiddipper.

6. In a portable excavator; an upper body; a boom mounted on said upperbody; a saddle block pivoted to said boom; a dipper; a handle for saiddipper slidable in said saddle block; sheaves on said boom and dipper; asheave mounted on each of two sides of said saddle block; a pair ofwinding drums on said upper body; a cable anchored near one end of saidhandle, trained about one of said saddle block sheaves, then about saidboom and dipper sheaves and connected to one of said winding drums tohoist and retract said dipper; another cable connected to the otherwinding drum, passed about the other sheave on said saddle block andanchored to enable it to move said handle in said saddle block to crowdsaid dipper; and means to selectively actuate said winding drums tothereby hoist, retract or crowd said dipper.

FRED L. WHITE.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 1,457,301 Ferris et al June 5,1923 1,721,761 Arnaud July 23, 1929 1,767,576 Burke June 24, 19301,891,351 George Dec. 20, 1932 2,084,449 Neese June 22, 1937 2,304,485Swanson Dec, 8, 1942 2,380,625 Zeilman et al. July 31, 1945 an, -'a

